The loneliest angel in the academy (an introvert) has become friends with a blue-skinned gal demon (an extrovert)! This is a friendship story between a blue-skinned gal and a socially awkward introvert, illustrated by the mother of a demon who can't help but adore her son, Juugoya, set in a youth graffiti of another world!!!!! In a high school created in a world where angels reside, a novice angel named Rian attends without making any friends, becoming a disliked outcast while relentlessly striving to become a great angel. To put it simply, she is a loner. However, she has a certain nemesis: Ruri, the academy's idol who looks like a gal demon. Despite her lack of academic skills, she is loved by everyone, which frustrates Rian. One day, for some reason, Rian ends up teaching Ruri how to study!? Confused by having to deal with someone she disliked, Rian is taken aback when Ruri enthusiastically says, "Let's start by being friends."